US, Russia in bids to halt fighting in Syria's Aleppo

US Secretary of State John Kerry began a diplomatic push in Geneva on Sunday as world powers desperately sought ways to halt the mounting carnage in the Syrian city of Aleppo. More than a week of fighting has killed hundreds of civilians and left a UN-backed peace process — jointly sponsored by Washington and Moscow — hanging by a thread. Kerry jetted in to Geneva for talks with Arab ministers and UN peace envoy Staffan de Mistura, but US officials admitted privately that much depends on Russia’s stance.